Fire-alarm system.



F. GOTYSCHALK. Fmi-ALARM SYSTEM. APPLICATION FILED FEB. 13. 1914.

` Patented Sept. 7,.'1915 FELX GOTTSCHALK, F STERLING, NEW JERSEY.

sinn-Alleen sesenta.

intacta Specification of Letters Patent.

rasantes sept. a', iai-5.

i' Application filed February 13, 19M. Serial No; Sl.

i To all whom it may concern l Be it known that I, FELIX GoT'rscHALK, acitizen of the United States, residing at Stirling, inthe county ofMorris and State of New flei'sef/,have invented certain new and 4useful.Improvements in Fire-Alarm Systems, of which the following is aspecification, reference being had to the accompanying drawing.

My invention relates to tire alarm systems,

wherein a telephone line and its associated apparatus is utilized intransmitting a characteristic signal from the 4premises protected 4to adistant point.

The objects of inyinvention are to eliminate the necessity of makingelectrical connections to the telephone line, or connect- `ing theretoor to the instrument, additional devices which couldin any Way affectthe talking qualities of same. i

A further object is to provide a system 1n which simple fusible linksmay be employed,

which by melting,v so adect a circuit as to cause the operation ot theapparatus connected therew1th,wliich in turn actuates the telephoneswitch hook thereby closing the' telephone line circuit, -andthusenabling a characteristic signal, automatically pro.-

' duced, to be transmitted over the line.

There are other objects asliereinafter de-A scribed.

In the accompanying drawings, Figure l is `a diagrammatic View otanelectrically actuated device for releasing the telephone switch hook,and FigiQ, a diagram showing the circuit connections of the apparatusshown in Figfl.

Like figures of reference denote the same .parts Wherever shown.

l denotes anv ordinary telephone instrument of any type. Forillustration a desk stand is shown.- Attached to the switch-y v hook 2of the telephone is the case 3, containingactiiating mechanism connectedby lever l to the hook, whereby the hook may be; released. The casecontains a suitable release' mechanism 5 comprising an' armatureconnected to the member 4 and electromagncts for actuaiiingir thearmature, a vibrating member, such as a buzzer 6, and a normally closedrelay 7. The relay Z Vis connected to anl alarm circuit in series withone or more fuses 8 and a source of energy such as the rlliese fuses areadapted to melt latch, a circuit .including y a circuit, a device changeits reslstancein the presence of ab-y in the presence of abnormal heator rather to increase or decrease in resistance-so as tolcorrespondingly aHect the circuit. .As the naturev and construction of-such devices are Well known, l do not describe saine here.

In operation, should 8 be melted, relay 7 opens its contacts permittingenergy to fioW` through the Winding of release mechanism 5 whichoperates, releasing the telephone hook switch 2. Current also flowsthrough the device 6 which produces a distinctive tone giving any onewho listens a distinctive lire signal.

Having thus described my invention, l claim:

l. In an electric alarm system of the character described, thecombination of a telephone having a .switch hook, a latch for holdingsaid switch hook in its normal position, electrical -means for releasingsaid latch, a circuit including:r a source of energy, thermostaticcircuit openers and a relay, and a circuit including normally opencontacts on said relay, said source of energy and said electricalmeans.`

2. In an electric alarm system of the character described, thecombination of atelephone having a switch hook, a latch for holding saidswitch hook in its normal po` sition, electrical means for releasingsaid a source of energy, thermostatic circuit openers and a relay, a

`circuit including normally open contacts on said relay, said source ofenergy and said electrical means, and a sound producing devicecontrolled by said relay.

8. ln an electric alarm system of the-char'- acter described, thecombination of a tele- 'phone having a switch hook, actuating means forsaid hook, electrically voperated means for controlling said actuatingmeans, in said circuit, adapted to and said tone is transmitted over theteleyphone line, thereby

